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Finding the Fourth Proportional to 861,125.37, 1,291,978.64 and 381,287.67

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Solution

The fourth proportional to 861,125.37, 1,291,978.64 and 381,287.67 is: 572,060.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,125.37 : 1,291,978.64 = 381,287.67 : x
  2. Step 2: Convert to fraction form
    861,125.37/1,291,978.64 = 381,287.67/x
  3. Step 3: Cross multiply
    861,125.37x = 1,291,978.64 × 381,287.67
  4. Step 4: Simplify right side
    861,125.37x = 492,615,525,335.37
  5. Step 5: Solve for x
    x = 492,615,525,335.37/861,125.37
  6. Step 6: Final answer
    x = 572,060.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.